JP2016078112A - Metal mold heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a metal mold heater capable of efficiently preheating a fixed metal mold and a movable metal mold.SOLUTION: There is provided the metal mold heater to be disposed between a fixed metal mold 50 and a movable metal mold 51 opposed to the fixed metal mold and capable of moving toward and away from the fixed metal mold, for preheating the fixed metal mold and the movable metal mold, before molten material is injected inside a cavity formed by clamping the fixed metal mold and the movable metal mold. The metal mold heater includes: a main body 2 to be disposed between the fixed metal mold and the movable metal mold; a penetration space formed at the main body so as to penetrate the main body, and having openings that open at a first opposing surface opposed to the fixed metal mold and at a second opposing surface opposed to the movable metal mold respectively, when the main body is disposed between the fixed metal mold and the movable metal mold; and multiple infrared heaters 3 each including carbonaceous heating elements encapsulated in a glass tube, and arranged so as to be adjacent to one another in a predetermined direction, at positions opposed to the cavity formed at one or both of the fixed metal mold and the movable metal mold, in the penetration space, for irradiating the cavity with infrared light by electrification of the carbonaceous heating elements, to heat the cavity.SELECTED DRAWING: Figure 6

Description

  This invention arrange | positions between a fixed mold and the movable mold which can be contacted / separated to this fixed mold facing the said fixed mold, and the metal which preheats the said fixed mold and the said movable mold The present invention relates to a mold heating device.

  For example, Patent Document 1 discloses a die heating method in which an upper die and a lower die of a casting machine are preheated prior to injection of molten metal by adopting an electric heating method instead of a conventional gas burner method having poor thermal efficiency. An apparatus is disclosed. This mold heating apparatus includes a plurality of ceramic heaters arranged in parallel at predetermined intervals in a cylindrical heat insulating container whose upper and lower surfaces are open and can be taken in and out between an upper mold and a lower mold. And the upper end surface of the heat insulating container is shaped to fit into the lower end surface of the upper mold, and the lower end surface of the heat insulating container is shaped to fit into the upper end surface of the lower mold. Prior to the injection of the molten metal, the upper mold is raised, the mold heating device of Patent Document 1 is arranged between the upper mold and the lower mold, and the upper end surface of the heat insulating container is fitted to the lower end surface of the upper mold. At the same time, after the lower end surface of the heat insulating container is fitted into the upper end surface of the lower mold, the upper mold and the lower mold are heated to a predetermined temperature and preheated by a ceramic heater.

Japanese Utility Model Publication 3-47724

  However, in the above mold heating device, the upper end surface of the heat insulating container is fitted into the lower end surface of the movable mold such as the upper mold, and the lower end surface of the heat insulating container is fixed to the fixed mold such as the lower mold. As a result of being fitted into the upper end surface, there is a disadvantage that the fixed mold and the movable mold of the casting machine cannot be sufficiently preheated unless a ceramic heater is disposed at a predetermined position.

  The present invention has been proposed in view of such a situation, and an object thereof is to provide a mold heating apparatus capable of efficiently preheating a fixed mold and a movable mold.

  In order to achieve the above object, a mold heating apparatus according to the invention of claim 1 clamps a fixed mold and a movable mold that faces the fixed mold and can be contacted and separated from the fixed mold. A mold heating device that is disposed between the fixed mold and the movable mold and preheats the fixed mold and the movable mold before injecting the molten material into the cavity formed as described above The main body disposed between the fixed mold and the movable mold, and formed on the main body, when the main body is disposed between the fixed mold and the movable mold, A through space that opens to the first facing surface that faces the fixed mold and a second facing surface that faces the movable mold and penetrates the main body, and the opening of the first facing surface within the through space; Facing the opening of the second facing surface, one or both of the fixed mold and the movable mold A plurality of carbonaceous heating elements are enclosed in a glass tube and arranged adjacent to each other in a predetermined direction at a position facing the formed cavity, and the cavity is irradiated with infrared rays by energizing the carbonaceous heating element. An infrared heater for heating the cavity, a first power line arranged outside the main body and connected to an external power source, and a second power line connected to each infrared heater and used to supply current to each infrared ray are connected. And a connecting portion.

  According to a second aspect of the present invention, in the configuration according to the first aspect, the outer surface of the main body is provided with a cylindrical member that communicates with the main body and extends outward from the outer surface by a predetermined length. The power line is inserted into the cylindrical member at the distal end side in the extending direction of the cylindrical member, and the second power line is inserted into the cylindrical member at the proximal end side in the extending direction of the cylindrical member, and the connection The terminal box that accommodates the portion is disposed at a substantially intermediate portion in the extending direction of the cylindrical member between the proximal end side and the distal end side.

  According to a third aspect of the present invention, in the configuration according to the first or second aspect, each of the infrared heaters is disposed in the through space close to the fixed mold in a contact / separation direction of the movable mold with respect to the fixed mold. It is characterized by having been arranged at the position.

  According to a fourth aspect of the present invention, in the configuration according to any one of the first to third aspects, the main body is positioned between the infrared heaters when viewed from a direction orthogonal to the first opposed surface and the second opposed surface. A plurality of rod-like members are attached along the respective infrared heaters so as to span the opening of the first opposing surface and the opening of the second opposing surface.

  According to a fifth aspect of the present invention, in the configuration according to any one of the first to fourth aspects, the main body is provided on the main body, and the main body is disposed between the fixed mold and the movable mold. And a closing member that closes at least one of a gap between the fixed mold and the gap between the main body and the movable mold.

  According to a sixth aspect of the present invention, in the configuration according to any one of the first to fifth aspects, the first facing the fixed mold in the contact / separation direction of the movable mold with respect to the fixed mold on the first facing surface. A position adjusting device for adjusting the position of the facing surface is provided.

According to the mold heating device of the first aspect of the invention, by arranging a plurality of infrared heaters at positions facing the cavities in the through space, the infrared rays emitted from the infrared heaters intensively preheat the cavities. It becomes possible to do. Moreover, since the heat energy of the infrared radiation heat emitted from the infrared heater is not taken away by the air, the infrared rays can directly heat the fixed mold and the movable mold. From these things, it becomes possible to efficiently pre-heat the fixed mold and the movable mold.
In addition, when the connection portion between the first power line connected to the external power source and the second power line connected to each infrared heater is arranged outside the back surface of the main body, it is compared with the case where the connection portion is arranged inside the main body. Thus, a wide penetration space can be secured inside the main body. In connection with this, the freedom degree which arrange | positions each infrared heater in penetration space can be improved.
According to the invention of claim 2, when the mold heating device is arranged between the fixed mold and the movable mold, it is possible to prevent the terminal box from colliding with the fixed mold and the movable mold. Therefore, it becomes easy to position the mold heating device between the fixed mold and the movable mold.
According to the invention of claim 3, it becomes easier to irradiate infrared rays to the fixed mold as compared with the movable mold. Thereby, compared with a movable metal mold | die, the degree of the preheating of a fixed metal mold | die can be raised.
According to the invention of claim 4, a plurality of infrared heaters are arranged adjacent to each other in a predetermined direction, and the infrared heater and the rod-shaped member are overlapped with each other when viewed from a direction orthogonal to the first facing surface and the second facing surface. It can prevent being arranged. For this reason, the radiant heat of the infrared heater can be smoothly applied to the fixed mold through the adjacent bar-like members that are passed over the opening of the first opposing surface, and the radiant heat is applied to the opening of the second opposing surface. Thus, the movable mold can be smoothly irradiated between the adjacent rod-shaped members.
According to the invention of claim 5, when the main body is disposed between the fixed mold and the movable mold, the gap between the main body and the fixed mold or the main body and the movable mold is formed by the closing member. At least one of the gaps between the molds can be closed. For this reason, it is possible to prevent infrared radiant heat from leaking to at least one of the outside of the fixed mold and the outside of the movable mold.
According to the sixth aspect of the invention, by using the position adjusting device, it is possible to adjust the position at which the first facing surface approaches the fixed mold according to the shape of the fixed mold. Thereby, it becomes possible to efficiently irradiate the fixed mold with infrared radiant heat through the opening of the first facing surface.

It is the perspective view which looked at the metallic mold heating device of the embodiment of the present invention from the upper part. It is the perspective view which looked at the same mold heating device from the lower part. It is the top view which looked at the same mold heating device from the upper part. It is a side view of the same mold heating device. It is a perspective view which shows the state which left | separated the upper mold | type with which a casting machine is provided by the predetermined distance from the lower mold | type. It is a perspective view which shows the state which mounted the metal mold | die heating apparatus on the upper surface of the lower mold in the state where the upper mold was separated from the lower mold by a predetermined distance.

  An embodiment of the present invention will be described with reference to FIGS. A mold heating apparatus 1 shown in FIGS. 1 to 4 includes a main body 2, an infrared heater 3, a rod-like member 4, a closing member 5, and a tubular member 6. Below, each structure is demonstrated in order of the main body 2, the infrared heater 3, the rod-shaped member 4, the closure member 5, and the cylindrical member 6. FIG.

<Configuration of body 2>
The main body 2 is made of stainless steel and is hollow and formed in a horizontally long box shape in a side view. As an example, the main body 2 has a longitudinal dimension of about 630 mm, a lateral dimension of about 400 mm, and a height dimension of about 100 mm. As shown in FIG. 3, the main body 2 is provided with a through space 8 in a portion excluding the front end portion (left side in FIG. 3) and the rear end portion (right side in FIG. 3). This through space 8 is formed to open to the upper surface of the main body 2 (upper side in FIG. 1) and the lower surface of the main body 2 (lower side in FIG. 1) and penetrate the main body 2.

<Configuration of infrared heater 3>
As shown in FIG. 1, the infrared heater 3 has an elongated shape extending in the front-rear direction and is built in the main body 2. The infrared heater 3 is disposed in the through space 8 so as to face the opening 13 (see FIG. 1) on the upper surface of the main body 2 and the opening 14 (see FIG. 2) on the lower surface of the main body 2. Here, as shown in FIG. 1, an example in which six infrared heaters 3 are arranged adjacent to each other in parallel in the left-right direction of the main body 2 in the through space 8 is shown. Each infrared heater 3 has a carbonaceous heating element 21 (see the broken line in the figure) inside an elongated quartz glass tube 20 (see the two-dot chain line in FIG. 3) in which an inert gas (for example, argon gas) is sealed. Two rows are arranged in the left-right direction. The front end face of each quartz glass tube 20 is closed, and the opening on the rear end face of each quartz glass tube 20 is closed by a base 22 (see FIG. 4) on which an external connection terminal protrudes. As shown in FIG. 4, each quartz glass tube 20 is placed in the through space 8 in the direction in which the upper mold 51 is in contact with and separated from the lower mold 50 of the casting machine 52 described later (the vertical direction in FIGS. 5 and 6). It is arranged at a position close to 50.
In the quartz glass tube 20, the front end sides (the left side in FIG. 3) of both the carbonaceous heating elements 21, 21 are electrically connected to each other by electric wires (not shown), whereby both the carbonaceous heating elements 21. , 21 are connected in series. On the other hand, the rear end side (the right side in FIG. 3) of each carbonaceous heating element 21 is electrically connected to the external connection terminal by an electric wire (not shown). The left-right direction of the main body 2 is an example of a predetermined direction of the present invention.

<Configuration of rod-shaped member 4>
As shown in FIG. 1, five rod-like members 4 are made of stainless steel and are arranged in parallel with the infrared heater 3 in the opening 13 so as to be positioned between the infrared heaters 3 and 3 in a plan view. Thereby, the infrared heater 3 and the rod-shaped member 4 are prevented from overlapping in the vertical direction of the main body 2. In addition, a rod-like member 4 is stretched in parallel with the infrared heater 3 on the outside of each infrared heater 3 disposed at both ends in the left-right direction of the main body 2. In addition, the up-down direction of the main body 2 is an example of a direction orthogonal to the first facing surface and the second facing surface of the present invention.
Each rod-like member 4 penetrates through stainless steel holding members 23 to 26 erected in the left-right direction on the upper surface of the main body 2 and is held by the holding members 23 to 26. Here, the holding members 23 to 26 are erected on the upper surface of the main body 2 at a predetermined interval in the front-rear direction of the main body 2 (the elongated direction of the infrared heater). Each of the holding members 23 to 26 has seven through holes through which the rod-like members 4 are inserted in the same direction as the left-right direction of the main body 2. Therefore, when exchanging the rod-shaped member 4, it is only necessary to insert the new rod-shaped member 4 through the through-hole after extracting the rod-shaped member 4 before the replacement from the through-hole.

<Configuration of closing member 5>
As shown in FIG. 2, a plate-like closing member 5 made of stainless steel is vertically suspended from the main body 2 so as to surround the opening 14 on the lower surface of the main body 2. Similarly to the case where the rod-like member 4 is disposed in the opening 13 on the upper surface of the main body 2 described above, seven rod-like members 4 are also stretched in the opening 14 along the elongated direction of the infrared heater 3. Yes. In this embodiment, as shown in FIG. 3, the rod-like member 4 penetrates the closing member 5A, the holding members 27 and 28, and the closing member 5B, and is held by the closing member 5A, the holding members 27 and 28, and the closing member 5B. Yes. Here, the closing member 5A is formed in a plate shape that is long in the left-right direction of the main body 2, and is suspended downward from the rear edge of the opening 14, and the closing member 5B is formed in the same plate shape to form the opening 14. It hangs downward on the front edge of the. The holding members 27 and 28 are disposed in the opening 14 at a predetermined interval in the front-rear direction of the main body 2 (in the elongated direction of the infrared heater), and fixed downward to the left and right side walls of the through space 8. It was suspended. The closing members 5A and 5B and the holding members 27 and 28 are also provided with through holes through which the rod-like members 4 are inserted.

Furthermore, as shown in FIG. 2, support members 30 are suspended downward from the main body 2 at the left and right ends of the lower surface of the front end portion of the main body 2. Both strut members 30 are arranged to face each other in the left-right direction of the main body 2. Each column member 30 has a screw hole that opens on the lower surface thereof and passes through the axis of each column member 30. Further, a screw member 31 having a disk-like contact piece at the lower end is provided, and the screw member 31 can be screwed into the screw hole from the lower surface of the column member 30. Therefore, when the user rotates the screw member 31 horizontally, the screw member 31 can be moved in the direction in which the support member 30 is suspended. FIG. 4 shows an example in which the screw member 31 is horizontally rotated so that the lower end surface of the contact piece is positioned on the same plane as the lower end surface of the closing member 5.
A column member 30 in which the screw member 31 is screwed is also provided below the main body 2 at the left and right ends of the lower surface of the rear end portion of the main body 2. Both strut members 30 are also arranged on the lower surface of the rear end so as to face each other in the left-right direction of the main body 2. As will be described later, when the mold heating apparatus 1 is placed on the upper surface of the lower mold 50, the mold heating apparatus 1 is supported on the upper surface by a contact piece of a screw member 31 screwed into each support member 30. it can.

<Configuration of cylindrical member 6>
As shown in FIGS. 1 to 3, the tubular member 6 is made of stainless steel and extends rearward from the back surface 33 of the main body 2 by a predetermined length, and has a circular cross section. A stainless steel terminal box 35 is provided between the proximal end and the distal end in the extending direction of the tubular member 6 at a substantially intermediate portion in the extending direction. And this base end side was made into the 1st grip part 6A gripped by one hand of a user, and the said front end side was made into the 2nd grip part 6B gripped by the other hand of a user. One end surface of the first grip portion 6A communicates with the inside of the main body 2, and the other end surface of the first grip portion 6A communicates with the inside of the terminal box 35. On the other hand, one end surface of the second grip portion 6B communicates with the inside of the terminal box 35, and the first power line 37 is inserted into the second grip portion 6B.

  A terminal block 38 (see FIG. 4) is accommodated in the terminal box 35, and a first power line 37 is electrically connected to the terminal block 38. Further, a second power line (not shown) is inserted through the first grip portion 6 </ b> A and is electrically connected to the terminal block 38 and the external connection terminal of each infrared heater 3. Thus, the first power line 37 is electrically connected to the carbonaceous heating element 21 of each infrared heater 3 via the terminal block 38, the second power line, and the external connection terminal. The terminal block 38 is an example of the connection portion of the present invention.

<Preliminary heating method of mold using mold heating apparatus 1>
Next, a method for preheating the mold using the above-described mold heating apparatus 1 will be described. FIG. 5 shows a casting machine 52 that includes a metal lower mold 50 as a fixed mold and a metal upper mold 51 as a movable mold to obtain a predetermined molded product. The lower die 50 and the upper die 51 are arranged so that the first cavity 53 of the lower die 50 and the second cavity (not shown) of the upper die 51 are opposed to each other in the vertical direction. The upper die 51 can be brought into and out of contact with the lower die 50 by the device. When the upper die 51 is moved closer to the lower die 50 and the die is clamped by operating the lifting device, one cavity is formed by the first cavity 53 of the lower die 50 and the second cavity of the upper die 51. In the casting machine 52, after the upper mold 51 is clamped to the lower mold 50, for example, molten metal under pressure is injected from the injection port of the lower mold 50 into the cavity. A predetermined molded product is obtained by casting to solidify the molten metal. In the present embodiment, before the molten metal is injected into the cavity, the lower mold 50 and the upper mold 51 are preheated by the mold heating device 1 as described below. Thereby, since the fluidity | liquidity of the metal material in a cavity improves, as a result of preventing insufficient filling of the metal material in a cavity, the shaping | molding defect of a molded product can be suppressed.

Before the preliminary heating of the lower mold 50 and the upper mold 51, as shown in FIG. 5, the lifting device is operated to fix the upper mold 51 in a state of being separated from the lower mold 50 by a predetermined distance. Thereafter, the user grasps the first grip portion 6A with one hand and the second grip portion 6B with the other hand, while the lower surface of the closing member 5 of the mold heating device 1 as shown in FIG. Is placed on the upper surface of the lower mold 50 so as to cover the opening edge of the first cavity 53. At the same time, the mold heating device 1 is supported on the upper surface of the lower mold 50 by the contact pieces of the screw members 31. As a result, the upper side of the first cavity 53 is blocked by the mold heating device 1. At this time, since the terminal box 35 is provided at a substantially intermediate portion in the extending direction of the cylindrical member 6, the terminal box 35 is prevented from colliding with the upper mold 51 and the lower mold 50.
Subsequently, the lifting device is operated to bring the upper mold 51 close to the mold heating apparatus 1, and the mold heating apparatus 1 is disposed between the lower mold 50 and the upper mold 51. Thereby, the lower surface of the main body 2 faces the lower mold 50, and the upper surface of the main body 2 faces the upper mold 51. At this time, each infrared heater 3 is disposed at a position facing the first cavity 53 and the second cavity. In addition, the lower surface of the main body 2 is an example of the 1st opposing surface of this invention, and the upper surface of the main body 2 is an example of the 2nd opposing surface of this invention.

After that, when the first power line 37 of the mold heating apparatus 1 is connected to an external power source, the carbonaceous heat generation of each infrared heater 3 from the first power line 37 through the second power line electrically connected to the first power line 37. A current is supplied to the body 21. Then, each carbonaceous heating element 21 is red hot and generates infrared rays. This infrared ray is directly irradiated to the second cavity of the upper die 51 through the space between the adjacent rod-like members 4 and 4 spanned through the opening 13 of the mold heating device 1. As a result, the second cavity can be intensively preheated by infrared radiation heat. At the same time, the infrared rays emitted from the carbonaceous heating elements 21 pass directly between the adjacent bar-like members 4 and 4 spanned over the opening 14 of the mold heating device 1 and directly into the first cavity 53 of the lower die 50. Is irradiated. As a result, the first cavity 53 can be intensively preheated by infrared radiation heat. At this time, each infrared heater 3 is disposed at a position closer to the lower mold 50 in the contact / separation direction of the upper mold 51 with respect to the lower mold 50 (up and down direction in FIG. 6). 50 is easily irradiated with infrared rays. Thereby, compared with the upper mold | type 51, the degree of the preliminary heating of the lower mold | type 50 can be raised.
And since the heat energy of infrared radiant heat is not taken away by air, there is also an advantage that the lower mold 50 and the upper mold 51 can be preheated directly by infrared rays. At this time, the gap between the lower mold 50 and the main body 2 can be closed by the closing member 5. This prevents infrared radiant heat from leaking outside the lower mold 50.

  Further, in the mold heating apparatus 1, the screw member 31 protrudes from each column member 30 in the direction in which each column member 30 is suspended by horizontally rotating the screw member 31 screwed to each column member 30. The length can be changed. For this reason, when the screw member 31 is rotated horizontally, the position at which the lower surface of the main body 2 approaches the lower mold 50 can be adjusted according to the shape of the lower mold 50. Thereby, it becomes possible to efficiently irradiate various lower molds with infrared radiant heat through the openings 14 on the lower surface. In addition, the support | pillar member 30 and the screw member 31 are examples of the position adjustment apparatus of this invention.

  When the temperature of the lower mold 50 and the upper mold 51 is raised to a predetermined temperature by the preheating described above, the lifting device is operated to move the upper mold 51 from the lower mold 50 by a predetermined distance as shown in FIG. Fix in a separated state. Thereafter, the user holds the first grip portion 6 </ b> A with one hand and holds the second grip portion 6 </ b> B with the other hand while holding the mold heating device 1 between the lower die 50 and the upper die 51. Take out. As shown in FIG. 1 and FIG. 2, the user's hand accidentally enters the through space 8 from the openings 13 and 14 by passing the rod-like members 4 over the openings 13 and 14 of the mold heating device 1. Is prevented. Thereby, it can prevent that a user's hand touches the infrared heater 3 accidentally and is burned.

<Effect of this embodiment>
In the mold heating apparatus 1 of the present embodiment, a plurality of infrared heaters 3 are arranged at positions facing the first cavity 53 and the second cavity in the through space 8, so that the infrared rays emitted from the infrared heater 3 are the first. The first cavity 53 and the second cavity can be preheated intensively. Moreover, since the heat energy of the infrared radiant heat emitted from the infrared heater 3 is not taken away by the air, the infrared ray directly heats the lower mold 50 (first cavity 53) and the upper mold 51 (second cavity). it can. For these reasons, the lower mold 50 and the upper mold 51 can be efficiently preheated. As a result, it is possible to remarkably shorten the time required to raise the temperature of the lower mold 50 and the upper mold 51 to a predetermined temperature, as compared with the preheating by the conventional gas burner method having poor thermal efficiency. As a result, the production efficiency of the molded product by casting can be improved.
Further, when a terminal block 38 for connecting the first power line 37 connected to the external power source and the second power line electrically connected to the external connection terminal of each infrared heater 3 is arranged outside the back surface of the main body 2, Compared with the case where the terminal block 38 is arranged inside the main body 2, the through space 8 can be secured widely inside the main body 2. In connection with this, the freedom degree which arrange | positions each infrared heater 3 in the penetration space 8 can be improved.

  Further, when the mold heating device 1 is disposed between the lower mold 50 and the upper mold 51, the terminal box 35 can be prevented from colliding with the upper mold 51 and the lower mold 50. Therefore, it becomes easy to position the mold heating apparatus 1 between the upper mold 51 and the lower mold 50.

  Furthermore, since each infrared heater 3 is disposed in the penetrating space 8 at a position closer to the lower die 50 in the direction of contact of the upper die 51 with respect to the lower die 50, the infrared ray is applied to the lower die 50 compared to the upper die 51. It becomes easy to irradiate. Thereby, compared with the upper mold | type 51, the degree of the preliminary heating of the lower mold | type 50 can be raised.

  In addition, six infrared heaters 3 are arranged adjacent to each other in parallel in the left-right direction of the main body 2, and the infrared heater 3 and the rod-shaped member 4 are prevented from being arranged at the overlapping position in the vertical direction of the main body 2. it can. For this reason, the radiant heat of the infrared heater 3 can be applied to the lower mold 50 smoothly between the adjacent rod-shaped members 4 which are passed over the opening 13 of the mold heating apparatus 1 and the radiant heat is applied to the mold heating apparatus 1. The upper mold 51 can be smoothly irradiated through the space between the adjacent rod-shaped members 4 that are spanned by the openings 14.

  In addition, when the main body 2 of the mold heating apparatus 1 is disposed between the lower mold 50 and the upper mold 51, the gap between the main body 2 and the lower mold 50 is blocked by the closing member 5. Can do. For this reason, it is possible to prevent infrared radiant heat from leaking outside the lower mold 50.

  In addition, when the screw member 31 screwed into each support member 30 is rotated horizontally, the protruding length of the screw member 31 from each support member 30 in the extending direction of each support member 30 can be changed. For this reason, according to the shape of the lower mold | type 50, it becomes possible to adjust the position which makes the lower surface of the main body 2 approach the lower mold | type 50. FIG. Thereby, it becomes possible to efficiently irradiate various lower molds with infrared radiant heat through the openings 14 on the lower surface.

<Example of change>
The present invention is not limited to the above-described embodiment, and can be implemented by appropriately changing a part of the configuration without departing from the spirit of the invention. In the above-described embodiment, the example in which the closing member 5 is suspended downward from the main body 2 so as to surround the opening 14 on the lower surface of the main body 2 is shown, but the present invention is not limited thereto. For example, a closing member may be provided on the upper surface of the main body 2 so as to surround the opening 13, and the gap between the upper mold 51 and the main body 2 may be closed by the closing member. Thereby, infrared radiation heat can be prevented from leaking outside the upper mold 51.

  In the above-described embodiment, as shown in FIG. 2, one end of the rod-like member 4 that spans the opening 14 on the lower surface of the main body 2 is used as a through hole of the closing member 5 </ b> A that is suspended from the rear edge of the opening 14. Although the example in which the other end of the rod-like member 4 is inserted through the through-hole of the closing member 5 </ b> B suspended from the front edge of the opening 14 is shown, this is not restrictive. For example, instead of the closing member 5A, a holding member provided with a through hole is suspended downward at the rear edge of the opening 14 and the through hole is provided at the front edge of the opening 14 instead of the closing member 5B. After the other holding member is opened downward, the rod-like member 4 passes through the holding member, the holding members 27 and 28 (see FIG. 2), and the other holding members to hold the holding member. You may make it hold | maintain at a member, the holding members 27 and 28, and this other holding member. In this case, the closing member 5A is hung downward on the lower surface of the main body 2 outside the holding member, or the closing member 5B is hung downward on the lower surface of the main body 2 outside the other holding member. May be.

Further, in the above-described embodiment, the mold heating device 1 is disposed between the lower mold 50 in which the first cavity 53 is formed and the upper mold 51 in which the second cavity is formed, so that the lower mold 50 and the upper mold 50 are disposed. Although the example which preheats the type | mold 51 was shown, not only this but a cavity is formed only in a lower mold | type, and the metal mold | die heating apparatus 1 is made between this lower mold | type and the upper mold | type matched with this lower mold | type The lower mold and the upper mold may be preheated.
In addition, unlike the above-described embodiment, the mold heating device is disposed between a pair of molds that can be contacted and separated in the left-right direction, and the pair of molds is preheated by the mold heating device. May be.

  1 .... Mold heating device, 2 .... Main body, 3 .... Infrared heater, 5 .... Closing member, 6 .... Cylindrical member, 8 .... Penetration space, 13,14 ... Open, 20 .... Quartz glass Tube, 21 ... Carbonaceous heating element, 30 ... Strut member, 31 ... Screw member, 33 ... Back, 35 ... Terminal box, 37 ... First power line, 38 ... Terminal block, 50 ... Bottom Mold 51 ··· Upper die 53 ··· First cavity

Claims (6)

Before injecting the molten material into the cavity formed by clamping the fixed mold and the movable mold that faces the fixed mold and is movable toward and away from the fixed mold, the fixed mold And a mold heating device that preliminarily heats the fixed mold and the movable mold.
A main body disposed between the fixed mold and the movable mold;
A first opposing surface that is formed on the main body and faces the fixed mold and a second opposing surface that faces the movable mold when the main body is disposed between the fixed mold and the movable mold. A through space that opens and penetrates the main body,
In the through space, facing the opening of the first opposing surface and the opening of the second opposing surface and facing the cavity formed in one or both of the fixed mold and the movable mold. A plurality of carbonaceous heating elements enclosed in a glass tube and arranged adjacent to each other in a predetermined direction, and an infrared heater that heats the cavities by irradiating the cavities with infrared rays by energizing the carbonaceous heating elements;
A connecting portion that is arranged outside the main body and connects a first power line connected to an external power source and a second power line connected to each infrared heater and used to supply current to each infrared;
A mold heating apparatus comprising: On the outer surface of the main body, a cylindrical member that communicates with the main body and extends from the outer surface to a predetermined length is provided.
The first power line is inserted into the cylindrical member at a distal end side in the extending direction of the cylindrical member, and the second power line is inserted into the cylindrical member at a proximal end side in the extending direction of the cylindrical member. ,
2. The gold according to claim 1, wherein the terminal box containing the connection portion is disposed at a substantially intermediate portion in the extending direction of the cylindrical member between the proximal end side and the distal end side. Mold heating device.   The said infrared heater is arrange | positioned in the said penetration die in the position close | similar to the said fixed metal mold | die in the contact / separation direction of the said movable metal mold | die with respect to the said fixed metal mold | die. Mold heating device.   The main body is positioned between the infrared heaters when viewed from a direction orthogonal to the first opposed surface and the second opposed surface, and the opening of the first opposed surface and the second opposed surface along each of the infrared heaters 4. The mold heating apparatus according to claim 1, wherein a plurality of rod-like members are attached to the opening of the surface.   A gap between the main body and the fixed mold or between the main body and the movable mold when the main body is disposed between the fixed mold and the movable mold. The mold heating apparatus according to claim 1, further comprising a closing member that closes at least one of the gaps.   The position adjusting device for adjusting the position of the first opposed surface with respect to the fixed mold in the contact and separation direction of the movable mold with respect to the fixed mold is provided on the first opposed surface. The mold heating apparatus according to any one of 1 to 5.

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